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One-Dimensional Ising Model in Bethe Approrimation.
Calculate the magnetization for the one-dimensional Ising model in
a magnetic field in the Bethe approximation and compare with the exact
result (3.38).
sinh Bh
m =
/sinh² ßh + e-4BJ
(3.38)

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A positive charge of mass, 6.68 x 10-27 kg, passes through a velocity selector in a horizontal path as shown in the diagram below. The radius of the semicircular path of the positive charge, after it emerges through the slit on the right end of the velocity selector, is 6.96 cm. If the electric and magnetic fields have magnitudes of E = 500 N/C and B1 = B2 = 0.0100 T, what is the value of the positive charge? a. 3.20 x 10-19 C b. 1.20 x 10-19 C c. 1.60 x 10-19 C d. 6.40 x 10-19 C e. 4.80 x 10-19 C